[volt-nuts] Serious problems fluke 731A, 720 and solartron

J. L. Trantham jltran at att.net
Wed Oct 5 02:53:17 UTC 2011


Didier,

I will upload the 7061 manual later tonight.

Joe

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com]On
Behalf Of shalimr9 at gmail.com
Sent: Wednesday, October 05, 2011 3:07 PM
To: Volt-Nuts
Subject: Re: [volt-nuts] Serious problems fluke 731A, 720 and solartron

Joe,

I am interested in hosting your manuals on my web site.

Let me know if that's ok with you.

Didier KO4BB

Sent from my BlackBerry Wireless thingy while I do other things...

-----Original Message-----
From: "J. L. Trantham" <jltran at att.net>
Sender: volt-nuts-bounces at febo.com
Date: Sun, 25 Sep 2011 19:41:25
To: Discussion of precise voltage measurement<volt-nuts at febo.com>
Reply-To: Discussion of precise voltage measurement <volt-nuts at febo.com>
Subject: Re: [volt-nuts] Serious problems fluke 731A, 720 and solartron

Steve,

You must have something to do with aviation.

My meter just arrived in Oak Ridge yesterday.  Hopefully, it will be on the
way to England later this week.  Their turn around time estimate is 4 weeks.
Hopefully, I will have it back by first part of November.

I found the folks in Oak Ridge very friendly and helpful.  The lady I spoke
with offered to try to find a manual for the 7081 but did not have any.  She
did, though, have an operating manual for the 7061 that she sent me in .PDF
form.  If anyone wants it, let me know.  It is about 1 MB in size.  I have
not looked to see if one is posted anywhere around the net or not.

Also, I found a complete set of used manuals for the 7081 (Operating Part I,
Operating Part II, and Service) at Manuals Plus and bought them.  They have
yet to arrive.

I am anxious to see what they find in England and how it performs when it
gets back.

Joe

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com]On
Behalf Of Steve Krull
Sent: Tuesday, October 04, 2011 1:15 PM
To: volt-nuts at febo.com
Subject: Re: [volt-nuts] Serious problems fluke 731A, 720 and solartron


Joe,

I was within a couple of hundred yards of your 7081 this past week, if
it shipped to England without any delay! The Ametek/Solartron building
is just up the road from our pilot training center at Farnborough
Airport and I was there for meetings this past week. I had intended to
wander up the road and see if there was anyone left from the test
equipment group but time got away from me. The closest I got was driving
by the entrance to the industrial park.

While in England I did manage, through a friend, to pick up a set of
Solartron test leads with banana plugs, and he's going to see if he can
find his Kelvin clip set and probe set too. With the leads, good food,
good ale, good weather, and good company, it was a great trip. I
generally have at least one meeting a year at Farnborough and Gatwick
airports so I hope to eventually make it up the road to
Ametek/Solartron. Not sure if I want to take my 7081 in my luggage but I
may yet.

Steve




On Sun, Sep 25, 2011 at 11:31 AM, J. L. Trantham wrote:

> Fred,
>
> I have recently acquired a Solartron 7081 and have had a lot of fun
> getting
> to know the meter.  In an effort to get it 'calibrated', I chased down
> the
> US branch of AMETEK, the company that now apparently owns Solartron.
> I
> shipped my meter to them yesterday and they will ship it to England
> for
> calibration, repair and alignment, as needed.  The 7081 ceased
> production in
> 1998 and full support ended in 2008 but it is still supported, 'best
> endeavours'.
>
> When I was on the phone with them this AM to give them my credit card
> information, I asked if they still supported the 7061, remembering
> this
> thread.  She said the 7061 is still on the list of supported
> equipment.  So,
> worst case scenario, you could contact AMETEK and see what options
> might
> exist for your 7061.
>
> Joe
>
> -----Original Message-----
> From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com]On
> Behalf Of Fred Schneider
> Sent: Thursday, September 29, 2011 5:35 PM
> To: Discussion of precise voltage measurement
> Subject: Re: [volt-nuts] Serious problems fluke 731A, 720 and
> solartron
>
> The voltage collapses. I have to measure how much but not just a few
> uV.
> More like 200 mV if I remember it right. I know it is a resitive
> divider but
> the influence on each other is getting worse if it is on 24/7,
> another sign
> something is wrong. The 1V influences akso the 10 V so you keep it
> adjusting. If i set 10 V correct and then the 1 V's the 10 V is off
> again.
>
>
> The 845 AB had its nicads removed and they placed a big zener instead.
> The
> most important thing, I made a regulated and good filtered
> powersupply. I
> placed the pcb for that in the space the nicds were mounted.
> I also have a HP frequency standard that had a batterybox. But they
> were
> dead and i did not needed that so now i build a trimble thunderbolt
> into
> that space and used the 100 KHz output of the HP for the 10 MHz. That
> is the
> advantage of having gear with a battery option ;-)
>
> I can think i can fix the solartron Problem if I can find a service
> manual.
> But now I can not even check the powersupply voltages because I do not
> know
> them. Filtercaps are good.
>
> Fred
>
>
>>>
>>
>> Fred,
>>
>> What happens to the 10 volt position of the Fluke 731 when you attach
>> a 10
> MegOhm input Voltmeter ?
>>
>> I am sure you know that the 1 volt positions are just resistive
>> dividers
> and any loading of any kind will drop their value.
>>
>> Also, could you give details on what modifications you made to the
>> 845AB ?
>>
>> thanks,
>>
>> Bill....WB6BNQ
>>
>>
>>
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